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package org.openjdk.jmh.samples;


import org.openjdk.jmh.annotations.Benchmark;

import org.openjdk.jmh.annotations.BenchmarkMode;

import org.openjdk.jmh.annotations.Mode;

import org.openjdk.jmh.annotations.OutputTimeUnit;

import org.openjdk.jmh.annotations.Scope;

import org.openjdk.jmh.annotations.Setup;

import org.openjdk.jmh.annotations.State;

import org.openjdk.jmh.annotations.TearDown;

import org.openjdk.jmh.runner.Runner;

import org.openjdk.jmh.runner.RunnerException;

import org.openjdk.jmh.runner.options.Options;

import org.openjdk.jmh.runner.options.OptionsBuilder;


import java.io.IOException;

import java.net.URI;

import java.net.URISyntaxException;

import java.security.NoSuchAlgorithmException;

import java.security.Policy;

import java.security.URIParameter;

import java.util.concurrent.TimeUnit;


@BenchmarkMode(Mode.AverageTime)

@OutputTimeUnit(TimeUnit.NANOSECONDS)

public class JMHSample_33_SecurityManager {


 /*

  * Some targeted tests may care about SecurityManager being installed.

  * Since JMH itself needs to do privileged actions, it is not enough

  * to blindly install the SecurityManager, as JMH infrastructure will fail.

  */


 /*

  * In this example, we want to measure the performance of System.getProperty

  * with SecurityManager installed or not. To do this, we have two state classes

  * with helper methods. One that reads the default JMH security policy (we ship one

  * with JMH), and installs the security manager; another one that makes sure

  * the SecurityManager is not installed.

  *

  * If you need a restricted security policy for the tests, you are advised to

  * get /jmh-security-minimal.policy, that contains the minimal permissions

  * required for JMH benchmark to run, merge the new permissions there, produce new

  * policy file in a temporary location, and load that policy file instead.

  * There is also /jmh-security-minimal-runner.policy, that contains the minimal

  * permissions for the JMH harness to run, if you want to use JVM args to arm

  * the SecurityManager.

  */


 @State(Scope.Benchmark)

 public static class SecurityManagerInstalled {

  @Setup

  public void setup() throws IOException, NoSuchAlgorithmException, URISyntaxException {

   URI policyFile = JMHSample_33_SecurityManager.class.getResource("/jmh-security.policy").toURI();

   Policy.setPolicy(Policy.getInstance("JavaPolicy", new URIParameter(policyFile)));

   System.setSecurityManager(new SecurityManager());

  }


  @TearDown

  public void tearDown() {

   System.setSecurityManager(null);

  }

 }


 @State(Scope.Benchmark)

 public static class SecurityManagerEmpty {

  @Setup

  public void setup() throws IOException, NoSuchAlgorithmException, URISyntaxException {

   System.setSecurityManager(null);

  }

 }


 @Benchmark

 public String testWithSM(SecurityManagerInstalled s) throws InterruptedException {

  return System.getProperty("java.home");

 }


 @Benchmark

 public String testWithoutSM(SecurityManagerEmpty s) throws InterruptedException {

  return System.getProperty("java.home");

 }


 /*

  * ============================== HOW TO RUN THIS TEST: ====================================

  *

  * You can run this test:

  *

  * a) Via the command line:

  *    $ mvn clean install

  *    $ java -jar target/benchmarks.jar JMHSample_33 -f 1

  *    (we requested 5 warmup iterations, 5 forks; there are also other options, see -h))

  *

  * b) Via the Java API:

  *    (see the JMH homepage for possible caveats when running from IDE:

  *      http://openjdk.java.net/projects/code-tools/jmh/)

  */


 public static void main(String[] args) throws RunnerException {

  Options opt = new OptionsBuilder()

          .include(JMHSample_33_SecurityManager.class.getSimpleName())

          .warmupIterations(5)

          .measurementIterations(5)

          .forks(1)

          .build();


  new Runner(opt).run();

 }

// 关于 SecurityManager ，可以通过注入的方式来修改 SecurityManager，用处不大
}

